Keep standard INNER joins above possible OUTERs

Keep standard INNER joins above possible OUTERs

We always join metabib.record_attr, and we always use an INNER join
to the core table, so keep that join first.  Likewise with the join
to biblio.record_entry.  Dynamic joins may be OUTER, though, and while
join reordering in Postgres is smart, let's not give it the chance to
fail.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Ben Shum <bshum@biblio.org>